BREMERTON — Health officials are advising people to avoid contact with the water of Sinclair Inlet after 1,000 gallons of untreated sewage was spilled at Puget Sound Naval Shipyard and Intermediate Maintenance Facility.

The spill occurred between Sunday afternoon and Monday morning, according to a notice from Kitsap Public Health District. The no-contact advisory remains in effect through Friday. Shellfish harvests are already closed in the inlet due to ongoing pollution.

According to a statement from the shipyard, an open valve allowed sewage to spill out of a holding tank into a utility area at Dry Dock 6. The effluent then flowed through a drainage pipe and into the inlet.

The cause of the open valve is being investigated, according to the statement.